An amplifier may have a region of dead band as shown in Figure E2.25. Use an approximation that uses a cubic equation y = ax3 in the approximately linear region. Select a and determine a linear approximation for the amplifier when the operating point is x = 0.6.

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2.0 1.6+ 1.2 + 0.8 0.4 + -1.2 -0.8 -0.4 0.4 0.8 1.2 -0.4 -0.8 + -1.2+ FIGURE E2.25 An amplifier with a deadband region. -1.6+ -2.0+